I have a R53 MCS (2003). I currently have a 19% pulley on the supercharger.


I have heard both, "You can't use a 19% pulley on the supercharger and a 2% Crank pulley."

and

"You can use both, you just lower the life of your supercharger!"

INPUT PLEASE?!

 

General consensus is don't do it, because your spinning the S/C so much faster at anything more than normal driving it will cause excessive wear.
The real enemy here is heat, you're already pushing the limits with the 19% alone, basiclly the excessive heat you will be making will not only cause extra wear but will cancel out any performance benefits from any extra boost you may gain & will prob. lose you some power in the upper rpm's from what you already have.
Not to mention other possible engine problems from pushing excessively hot air into the cylinders.

 

What about m7's DFIC, and a 180*F thermostat?

 

From what I understand it's more about the Intake Air Temperature. When the SC is spinning that fast it gets the air too hot, all the gasses expand, are less dense, etc. This heat negates the advantage of compressing the air in the first place.

A larger InterCooler from a GP may help some, but we're up against the laws of physics here.

 

makes sense. common misconception of the idea behind the supercharger, but it makes sense now. didn't think of it that way, glad to have forums to discuss it though! thanks!

i was thinking heat, but more like internal engine heat caused by the supercharger, and figured if the air could be cooled by the intercooler it would be fine, but if its hot air being created in the first place, there is "more of it" in less dense form, not allowing it move quickly, with enough density to cause a significant change.

Less boost, more dense would be just as efficient and cause less damage.


THANKS!

 

Yup, the only way to combat that kind of heat would be to add W/M, but as was pointed out you're starting out with less dense air to begin with, so everything sort of cancels itself out, all the while putting excessive heat stress on the bearings & mechanicals of the S/C itself.

The only way to safely get more boost than you currently have is to do an S/C swap, Sprintex, TVS or Turbo, but if you're desired result is simply more power, without getting into the engine, a head swap or the kind of expense involved in a S/C, you may want to look into a good W/M setup, should really compliment what you have, and would also negate the need for an expensive I/C Change too.

On a side note, ask Chad about the 25mm hollow instead of the solid 22mm, less weight, same result.

 

Hey thanks! I was looking at S/C also. I have the money set aside already for a rebuilt port and polished S/C and was going to port and polish the "horns" and intake manifold also. As far as W/M.....Where are you finding this for a good price? haha

 

At a 21% reduction....you also get into the need for custom tune...to deal with the leaning caused by so much boost...and the cars own max flow cutoff...sometimes an issue with ONLY A 19%....guess if you stayed below 5000 rpm or so you might be OK...but a few folks saw that the pistons did fail on gen 1 cars at about 20 psi if I recall right...so something to watch....
Guess you a you could try it.....
But if you need the car as a driver (aka not a 2nd or 3 rd car), I would suggest keeping it a why not...

 

As far as W/M is concerned & cheap, your best bet is to look around for someone who's selling their old Devils Own, Snow or something like that. The best out there is the Aquamist, but they're not cheap, but with your setup & the fact that, for now, your basicly just looking to cool your intake charge, you could easily find a good deal on a used system that would suit your needs.

IMO, as far as W/M goes, I see it this way, if your just looking to cool things down, the lesser, boost based systems are just fine. Basiclly what you'll see as far as power gains would be like comparing what your car runs like on a 90* day-vs-a 60* day. But if your looking to use it to really try & make power & tune for it, you should just get the Aquamist, not only is it the safest in that application, but you'll know you've done the best you can.

 

Thanks. As far as boost goes.....How do you like the Sprintex? I heard that a twin screw pushes more boost at all times. Is this true?

 

I love mine, I won't ever go back, PM me if you'd like some particulars.

Here's the ballpark #'s with the Sprintex & the optional pulleys:
70mm/69mm ~ 15.5-16psi (stock w/ kit)
64mm ~ 17.5-18.psi
60mm ~ 19+psi

 

Remember....
The sprintex is about making boost more efficiently...aka at lower temps with less heat, so you can make more power at similar boost levels....
The roots style m45 that is the OEM mini is great for 5-7 psi, but begins to make tons of hot air as it is pushed harder....

 

Please do your research before thinking about swapping to a sprintex. You might want to check with other markets that have a Sprintex offering... I supported them full out when they where first released, but after 3 years worth of data coming in, I can not do that anymore.

Even with the stock SC and 19+% reduction you are just blowing hot air, and not making more power.